Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Sun Jan 19 14:41:18 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger359530
======================================================================
Trigger: 00359530 Segment: 000
BAT Trigger Time: 271531879.488 [s; MET]
Trigger Stop: 271531883.584 [s; MET]
UTC: 2009-08-09T17:31:14.504600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.645008350626 Dec: -0.0832895616909542 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.62
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 8.62
Analysis Position: [ source = BAT ]
RA: 328.645008350626 Dec: -0.0832895616909542 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 328.676295114875 Dec: -0.0960883536527028 [deg; J2000]
{ 21h 54m 42.3s , -00d 05' 45.9" }
+/- 2.1456530547026 [arcmin] (estimated 90% radius based on SNR)
+/- 1.0829894810255 [arcmin] (formal 1-sigma fit error)
SNR: 10.2202601934028
Angular difference between the analysis and refined position is 2.028203 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 8.86799997091293 +/- 2.87484886958812
Measured from: -0.143999993801117
to: 8.72399997711182 [s; relative to TRIGTIME]
T50: 3.00799995660782 +/- 1.41738346896597
Measured from: 1.95600003004074
to: 4.96399998664856 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.26399999856949
to: 3.26399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.711999952793121
to: 9.25600004196167 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.124350 0.229186 0.164849 0.063783
0.027404 0.028801 0.025708 0.023247 [error]
Peak 0.040525 0.040887 0.046027 0.017960
0.009225 0.009043 0.008491 0.007288 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 9.968 -0.712 9.256
T90 8.868 -0.144 8.724
T50 3.008 1.956 4.964
Peak 1.000 2.264 3.264
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.348 -0.255 0.258 - - - 3.75e-03 -5.60e-04 5.58e-04 55.470 57
CPL -1.143 -0.981 1.088 202.490 -202.490 -202.490 4.81e-03 -1.59e-03 1.29e-02 55.320 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.378 -0.361 0.362 - - - 8.88e-03 -1.77e-03 1.76e-03 62.380 57
CPL -1.233 -1.979 1.264 280.419 -280.419 -280.419 1.04e-02 N/A N/A 62.400 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 4.14e-08 8.35e-08 1.31e-07 4.56e-07 3.65e-07 7.12e-07 erg/cm2
90%_error_low -1.04e-08 -1.34e-08 -2.48e-08 -1.61e-07 -6.07e-08 -1.83e-07 erg/cm2
90%_error_hi 1.10e-08 1.32e-08 2.46e-08 2.14e-07 6.16e-08 2.28e-07 erg/cm2
Peak flux PL 3.25e-01 3.52e-01 2.71e-01 3.41e-01 1.08e+00 1.29e+00 ph/cm2/s
90%_error_low -1.12e-01 -7.82e-02 -6.74e-02 -1.50e-01 -2.16e-01 -2.60e-01 ph/cm2/s
90%_error_hi 1.24e-01 7.61e-02 6.58e-02 2.11e-01 2.17e-01 2.65e-01 ph/cm2/s
Fluence CPL 4.03e-08 8.57e-08 1.33e-07 3.21e-07 3.58e-07 5.79e-07 erg/cm2
90%_error_low -1.17e-08 -1.50e-08 -2.56e-08 -2.47e-07 -7.00e-08 -2.58e-07 erg/cm2
90%_error_hi 1.17e-08 8.28e-09 2.65e-08 1.81e-07 6.69e-08 2.00e-07 erg/cm2
Peak flux CPL 3.24e-01 3.53e-01 2.72e-01 3.22e-01 1.07e+00 1.28e+00 ph/cm2/s
90%_error_low -1.39e-01 -7.92e-02 -6.84e-02 -3.22e-01 -2.24e-01 -3.64e-01 ph/cm2/s
90%_error_hi 9.58e-02 8.50e-02 7.56e-02 1.35e-01 2.19e-01 2.70e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 328.6763 -0.0961 0.0188 27.7288 99.2232 0.5730937 10.220 TRIG_00359530 Foreground time interval of the image: -0.712 9.256 (delta_t = 9.968 [sec]) Background time interval of the image: -239.488 -0.712 (delta_t = 238.776 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.712 sec. to 9.256 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34833 ( -0.254538 0.25807 ) Norm@50keV : 3.75158E-03 ( -0.000560267 0.000558343 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.47 using 59 PHA bins. # Reduced chi-squared = 0.9732 for 57 degrees of freedom # Null hypothesis probability = 5.326170e-01 Photon flux (15-150 keV) in 9.968 sec: 0.451808 ( -0.067793 0.067905 ) ph/cm2/s Energy fluence (15-150 keV) : 3.65416e-07 ( -6.06699e-08 6.15842e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.712 sec. to 9.256 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.14254 ( -0.98103 1.08837 ) Epeak [keV] : 202.490 ( -202.596 -202.596 ) Norm@50keV : 4.80765E-03 ( -0.00158615 0.0128517 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.32 using 59 PHA bins. # Reduced chi-squared = 0.9879 for 56 degrees of freedom # Null hypothesis probability = 5.004860e-01 Photon flux (15-150 keV) in 9.968 sec: 0.448318 ( -0.069597 0.069467 ) ph/cm2/s Energy fluence (15-150 keV) : 3.58343e-07 ( -7.00271e-08 6.68523e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.264 sec. to 3.264 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37779 ( -0.361166 0.36215 ) Norm@50keV : 8.87545E-03 ( -0.00176857 0.0017582 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.38 using 59 PHA bins. # Reduced chi-squared = 1.094 for 57 degrees of freedom # Null hypothesis probability = 2.908985e-01 Photon flux (15-150 keV) in 1 sec: 1.07556 ( -0.216207 0.2171 ) ph/cm2/s Energy fluence (15-150 keV) : 8.61688e-08 ( -1.90306e-08 1.93743e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.264 sec. to 3.264 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37443 ( -1.96745 1.27515 ) Epeak [keV] : 9986.50 ( -9984.42 -9984.42 ) Norm@50keV : 8.90890E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.38 using 59 PHA bins. # Reduced chi-squared = 1.114 for 56 degrees of freedom # Null hypothesis probability = 2.598930e-01 Photon flux (15-150 keV) in 1 sec: 1.07309 ( -0.224118 0.21877 ) ph/cm2/s Energy fluence (15-150 keV) : 4.14639e-08 ( -2.42571e-08 1.71891e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 8.868 sec. Hardness ratio (energy fluence ratio) = 1.57101426515
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.2497098e-07 S(50-150 keV) = 2.404474e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -8.425224750239850E-02, IMY = -5.188565261520907E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.488000 -0.712000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.8188 10.9283 3.2 49.8 158.4 2.6387 3.6 1.6 GRS 1915+105 299.5852 35.2092 0.3 35.2 -168.7 9.9282 37.8 0.5 Cyg X-1 308.1454 41.0078 1.7 29.9 -155.4 1.5713 6.9 3.7 Cyg X-3 326.2951 38.1648 2.9 16.6 -142.1 0.8410 4.1 11.1 Cyg X-2 304.4947 14.8024 2.4 34.3 154.3 1.4926 4.8 ------ UNKNOWN 316.8222 16.6847 2.2 22.7 147.1 1.1519 5.2 ------ UNKNOWN 29.0217 -2.2681 1.8 55.6 8.4 6.9384 6.6 ------ UNKNOWN 358.5518 45.0889 2.6 24.8 -70.3 1.1570 4.4 ------ UNKNOWN 271.9558 39.9135 3.4 57.0 -161.6 3.2372 3.4 ------ UNKNOWN 337.4745 54.8703 3.3 29.2 -106.1 1.0816 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.712000 9.256000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.8202 10.8365 6.3 49.8 158.3 -0.2241 -1.8 6.7 GRS 1915+105 299.7834 35.1015 0.0 35.1 -168.8 -0.0322 -0.7 11.2 Cyg X-1 307.9183 40.8008 0.0 30.0 -155.9 0.0348 0.9 12.6 Cyg X-3 326.2550 38.4619 7.3 16.8 -141.5 -0.0538 -1.6 9.3 Cyg X-2 328.6763 -0.0961 1.1 27.7 99.2 0.5732 10.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 88.212590 193.412600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.7087 11.1244 0.0 41.3 168.2 0.2470 1.2 12.0 GRS 1915+105 299.6475 35.2202 2.4 44.5 -153.4 0.9865 4.8 3.0 Cyg X-1 308.1586 40.9959 3.1 45.1 -140.8 0.9770 3.7 3.4 Cyg X-3 326.2099 38.3147 40.6 38.5 -122.0 0.0653 0.3 1.8 Cyg X-2 327.6882 -39.8954 2.5 39.8 62.3 1.6905 4.5 ------ UNKNOWN 284.7940 40.7833 2.5 57.0 -157.7 2.5284 4.7 ------ UNKNOWN